| 摘要 |
The novel scouring composition contains a surface-active agent and an abrasive powder. In this, less than 10 per cent by weight of the particles in the abrasive powder have a particle size above 150 mu m and less than 20 per cent by weight have a particle size below 10 mu m. The abrasive powder has, in particular, a hardness of from 1 to 4 on the Mohs' scale of hardness; it is preferably calcite. The abrasive powder advantageously has a particle size distribution curve within the region between the curves X in the figure, and even better within the region between the curves Y in the figure. The scouring composition is in the form of a free-flowing powder or liquid composition. <IMAGE> |
